A good blouse is the most ­satisfying of purchases – it adds instantly to your roll call of ­outfits, can do work or pleasure, and requires minimal trying-on faff. But admittedly, what ­constitutes a good blouse right now falls between pretty narrow parameters. It must be silky or soft at least, and fall within a Starbucks colour palette from caffe latte to apricot frappuccino.